Dry-wet spinning solidification equipment and lyocell spinning equipment

Abstract

The invention discloses a dry-wet spinning solidification device and a lyocell spinning device.The dry-wet spinning solidification device comprises a solidification bath tank used for containing solidification bath liquid; at least a local section of the wire guide pipe horizontally extends, one end of the wire guide pipe is provided with a liquid inlet communicated with the coagulating bath tank, the other end of the wire guide pipe is provided with a wire outlet, and tows in the coagulating bath tank enter the wire guide pipe from the liquid inlet, flow through the horizontal section of the wire guide pipe to be solidified and are pulled out from the wire outlet. According to the invention, the wire guide pipe is combined with the coagulating bath tank, the horizontal extension section of the wire guide pipe ensures that the wire bundle is uniformly stressed in coagulating bath liquid, the forming process of the fiber is more continuous and stable, and the design of the wire guide pipe effectively reduces turbulence and fluctuation when the fiber is in contact with the coagulating bath liquid; the problems of non-uniform fiber thickness and poor surface quality caused by unstable liquid flow in the traditional coagulating bath are avoided, and the Young modulus and tensile strength of the fiber are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a dry-wet spinning coagulation device and a lyocell spinning device. Background Art

[0002] Lyocell, as a new type of regenerated cellulose fiber, has been increasingly used in the textile industry in recent years due to its good strength, softness and environmental protection characteristics. At present, the preparation of Lyocell fiber mostly adopts the dry-jet wet spinning method, that is, the spinning solution is first sprayed out to form a primary stream, and then enters the coagulation bath for solidification and molding. However, the traditional dry-jet wet spinning process has some technical problems that cannot be ignored, which affects the performance of the fiber and the stability of production.

[0003] First, in the traditional dry-jet wet spinning process, the process of the spinning stream entering the coagulation bath from the spinneret is limited by the length of the air layer and the characteristics of the coagulation bath. The coagulation bath part of the dry-jet wet spinning method usually requires precise control of temperature and solution concentration to ensure the uniformity of fiber forming, but since the stability of the coagulation bath flow is difficult to ensure, problems such as uneven fiber diameter and poor surface quality are prone to occur during the forming process. This situation will directly affect the physical properties of Lyocell fibers, such as strength and ductility, and thus limit its potential in high-performance applications.

[0004] Secondly, in the traditional dry-jet wet spinning process, the solvents in the spinning solution and the coagulation bath are usually difficult to fully recycle. This waste of solvents not only increases production costs, but also causes serious pollution to the environment, limiting the sustainability of Lyocell fiber as an environmentally friendly fiber. N-methylmorpholine-N-oxide (NMMO), which is commonly used as a solvent in the spinning solution, will not only waste resources but also cause potential harm to the ecological environment if it cannot be effectively recycled during the spinning process.

[0005] In addition, during the stretching and orientation process of spinning, due to the short length of the dry section (air layer), the fiber failed to obtain sufficient orientation, resulting in low Young's modulus and tensile strength of the fiber when it was finally formed, affecting the overall mechanical properties of the fiber. Fluctuations in spinning speed and fiber quality can also easily lead to product inconsistency, thereby increasing the difficulty of subsequent processing.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a dry-wet spinning coagulation device and a Lyocell spinning device to achieve the purpose of improving the molding quality and production efficiency of Lyocell fibers.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A dry-wet spinning coagulation device, comprising: A coagulation bath tank, used for containing a coagulation bath liquid; The wire guide tube is horizontally extended at least partially, with a liquid inlet at one end connected to the coagulation bath and a wire outlet at the other end. The wire bundle in the coagulation bath enters the wire guide tube from the liquid inlet, flows through its horizontal section for coagulation, and is pulled out from the wire outlet.

[0009] Furthermore, a liquid outlet is provided at the bottom of the coagulation bath, the wire guide tube is arranged below the coagulation bath, the liquid inlet end of the wire guide tube is bent upward to communicate with the liquid outlet of the coagulation bath, and the wire outlet end is horizontally extended in a direction away from the coagulation bath.

[0010] Furthermore, a flow channel extending radially along the bottom wall of the coagulation bath is provided at the bottom of the coagulation bath, the liquid inlet of the wire guide tube is connected to the flow channel, and the wire outlet end is horizontally extended in a direction away from the coagulation bath.

[0011] Preferably, the flow channel extends radially outward from the center of the bottom of the coagulation bath tank to the edge of the bottom of the tank to form a liquid outlet, and the liquid inlet of the wire guide tube is connected to the liquid outlet of the flow channel; Preferably, the flow channel is arranged to be inclined downward from the center of the groove bottom to the edge thereof.

[0012] Further, the horizontally extending length of the wire guide tube is greater than the depth of the coagulation bath; Preferably, the horizontal extension length of the wire guide tube is 2-5 times the depth of the coagulation bath; Preferably, the wire guide tube is a glass wire guide tube.

[0013] Furthermore, it also includes a coagulation bath storage tank for storing coagulation bath liquid, the coagulation bath tank and the wire outlet end of the wire guide tube are respectively connected to the coagulation bath storage tank, the coagulation bath liquid in the coagulation bath storage tank is transported to the coagulation bath tank, flows from the coagulation bath tank through the wire guide tube and flows back to the coagulation bath storage tank.

[0014] Furthermore, the lower part of the outlet end of the wire guide tube has an open collecting tank, which is connected to the coagulation bath storage tank. The coagulation bath liquid in the wire guide tube flows from the outlet into the collecting tank and flows back to the coagulation bath storage tank from the collecting tank.

[0015] Furthermore, a communication port is provided at the bottom of the liquid collecting tank for communicating with the coagulation bath storage tank, and a filter screen is provided on the communication port.

[0016] Furthermore, the coagulation bath tank is arranged to taper in a stepped manner from the tank opening to the tank bottom.

[0017] The present invention also provides a lyocell spinning device, comprising the dry-wet spinning coagulation device described in any one of the above technical solutions.

[0018] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0019] In the present invention, at least a partial section of the wire guide tube is horizontally extended, and the filament bundle entering the horizontal section of the wire guide tube can be fully immersed in the coagulation bath, thereby extending the contact time between the filament bundle and the coagulation bath and improving the degree of solidification of the filament bundle in the coagulation bath.

[0020] When the tow passes through the horizontal section of the wire guide tube, it flows downstream along the direction of the wire guide tube, so that the tow can maintain good directionality and stability during the solidification process. This directional effect prevents the tow from random swinging and irregular movement during the stretching and molding process, further improving the overall uniformity and tensile strength of the fiber. In addition, the tow flows downstream along the direction of the wire guide tube, so that the tow maintains a certain tension during the solidification process, achieving continuous orientation and stretching, so that the tow solidifies while being directional stretched, effectively improving the Young's modulus and tensile strength of the fiber.

[0021] Furthermore, in the present invention, by combining the wire guide tube with the coagulation bath, the horizontal extension section of the wire guide tube ensures that the force of the filament bundle in the coagulation bath is balanced, and the fiber forming process is more continuous and stable. The design of the wire guide tube effectively reduces the turbulence and fluctuation when the fiber contacts the coagulation bath, avoiding the problems of uneven fiber thickness and poor surface quality caused by unstable liquid flow in the traditional coagulation bath.

[0022] In addition, the present invention reduces the volatilization and waste of solvents by centrally flowing the coagulation bath in the wire guide tube, and the coagulation bath can be more effectively recycled, thereby reducing the pollution to the environment during the production process. Compared with the large amount of solvent used in the traditional open coagulation bath, the wire guide tube structure of the present invention saves solvents while reducing the adverse effects on the environment, and has higher environmental friendliness.

[0023] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings: Figure 1 It is a schematic diagram of the assembly structure of the lyocell spinning equipment of the present invention.

[0025] In the figure: 1. Coagulation bath tank; 11. First step tank; 12. Second step tank; 13. Notch; 14. Tank bottom; 2. Wire guide tube; 21. Bending section; 22. Horizontal section; 23. Wire outlet; 24. Connecting port; 3. Coagulation bath storage tank; 4. Spinneret; 5. Warping roller; 6. Washing and sizing equipment; 7. Drying roller; 8. Winding device; 9. Waste wire recovery device; 10. Motor; 101. Output shaft; 102. Transmission gear; 103. Metering pump; 104. Pump body; 105. Filter; 106. Spinning solution storage tank; 1061. Agitator; 107. Connecting pipe; 108. Fiber bundle.

[0026] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] As an embodiment of the present invention, a dry-wet spinning coagulation device applicable to a spinning device is provided, specifically, Figure 1 As shown, the dry-wet spinning coagulation equipment comprises a coagulation bath 1 and a wire guide tube 2. The coagulation bath 1 is used to contain a coagulation bath liquid, and the material of the coagulation bath 1 is preferably corrosion-resistant metal or high-strength plastic.

[0031] The wire guide tube 2 is a hollow tubular design with a smooth interior to reduce the friction resistance of the filament bundle 108 during the flow process. One end of the wire guide tube 2 is a liquid inlet, which is connected to the coagulation bath 1, and the other end is a wire outlet 23. At least a partial section of the wire guide tube 2 is horizontally extended to form a horizontal section 22. The horizontal section 22 of the wire guide tube is an important path for the coagulation of the filament bundle 108, and its length and inner diameter can be adjusted according to the requirements of the spinning process to ensure sufficient coagulation time and a stable flow environment.

[0032] During operation, the fine stream ejected from the spinning device first passes through a 2-3 mm air layer (dry section), during which the fiber is initially stretched and oriented. Subsequently, the fiber enters the coagulation bath 1 for initial coagulation. The coagulated filament bundle 108 enters the wire guide tube 2 from the coagulation bath 1 through the liquid inlet of the wire guide tube 2, continues to contact with the coagulation bath and further coagulates. The filament bundle 108 flows through the horizontal section 22 of the wire guide tube, and in this section, it is fully coagulated through uniform liquid flow and stable temperature control. Finally, the coagulated filament bundle 108 is pulled out by the traction device at the wire outlet 23, completing the coagulation process, and enters the downstream further processing steps, such as cleaning, stretching and other processes.

[0033] In this embodiment, at least a partial section of the wire guide tube 2 is horizontally extended, and the filament bundle 108 entering the horizontal section 22 of the wire guide tube 2 can be fully immersed in the coagulation bath, thereby extending the contact time between the filament bundle 108 and the coagulation bath and improving the degree of solidification of the filament bundle in the coagulation bath.

[0034] When the tow 108 passes through the horizontal section 22 of the wire guide tube 2, it flows downstream along the direction in which the wire guide tube 2 extends, so that the tow 108 can maintain good directionality and stability during the solidification process. This directional effect prevents the tow 108 from randomly swinging and irregularly moving during the stretching and molding process, further improving the overall uniformity and tensile strength of the fiber. In addition, the tow 108 flows downstream along the direction of the wire guide tube 2, so that the tow 108 maintains a certain tension during the solidification process, achieving continuous orientation and stretching, so that the tow 108 is solidified while being directional stretched, effectively improving the Young's modulus and tensile strength of the fiber.

[0035] Furthermore, in the present invention, by combining the wire guide tube 2 with the coagulation bath 1, the horizontal extension section of the wire guide tube 2 ensures that the force of the filament bundle 108 in the coagulation bath is balanced, and the fiber forming process is more continuous and stable. The design of the wire guide tube 2 effectively reduces the turbulence and fluctuation when the fiber contacts the coagulation bath, avoiding the problems of uneven fiber thickness and poor surface quality caused by unstable liquid flow in the traditional coagulation bath.

[0036] In addition, the present embodiment reduces the volatilization and waste of solvents by the centralized flow of the coagulation bath in the wire guide tube 2, and the coagulation bath can be more effectively recycled, thereby reducing the pollution to the environment in the production process. Compared with the large amount of solvent used in the traditional open coagulation bath, the wire guide tube 2 structure of the present invention saves solvents while reducing the adverse effects on the environment, and has higher environmental friendliness.

[0037] As an implementation method of this embodiment, a liquid outlet is provided at the bottom 14 of the coagulation bath tank 1 so as to discharge the coagulation bath liquid from the bottom 14. The wire guide tube 2 is arranged below the coagulation bath tank 1, and its liquid inlet end is bent upward to form a bending section 21, and the end opening of the bending section 21 is connected to the liquid outlet of the coagulation bath tank 1, so that the filament bundle 108 can naturally flow into the wire guide tube 2 along with the coagulation bath liquid.

[0038] The outlet 23 of the wire guide tube 2 is horizontally extended in a direction away from the coagulation bath 1, ensuring that the filament bundle 108 can fully contact the coagulation bath in the horizontal section 22 of the wire guide tube 2 to achieve a uniform coagulation effect. This arrangement helps the filament bundle 108 to be further coagulated in the process of flowing through the wire guide tube 2, while maintaining the stability and uniformity of the liquid flow.

[0039] This structural design ensures that the coagulation bath liquid flows smoothly in the wire guide tube 2, so that the wire bundle 108 can smoothly enter the wire guide tube 2 for further coagulation after completing preliminary coagulation in the coagulation bath 1. Through the connection of the bending section 21, the liquid can maintain a stable flow rate and temperature when entering the wire guide tube 2 from the coagulation bath 1 to avoid external interference.

[0040] The design of the liquid outlet of the bottom 14 of the coagulation bath 1 in this embodiment ensures that the coagulation bath can flow smoothly into the wire guide tube 2, maintains the stability and temperature of the liquid flow, reduces the interference of the external environment, and ensures the controllability and stability of the coagulation process. The bending section 21 of the wire guide tube 2 is connected to the liquid outlet of the coagulation bath 1, so that the liquid flow is unimpeded, which helps the tow 108 to smoothly enter the wire guide tube 2 from the preliminary coagulation stage for further coagulation. The horizontal section 22 of the wire guide tube 2 provides an opportunity to fully contact the coagulation bath, achieves a uniform coagulation effect, and ensures the consistency and high quality of the fiber.

[0041] As another implementation of this embodiment, the bottom 14 of the coagulation bath 1 is provided with a flow channel extending radially along the bottom wall of the coagulation bath 1. Specifically, the flow channel is a groove structure, which is recessed on the bottom 14. The flow channel starts from the center of the bottom 14 or a fixed point, and extends radially outward to the edge of the bottom 14 to form a liquid outlet to guide the flow of liquid. The liquid inlet of the wire guide tube 2 is connected to the liquid outlet of the flow channel; the flow channel can be arranged on the bottom 14 to be tilted downward from the center of the bottom 14 to its edge, so as to use gravity to help the liquid flow more smoothly. This structure can avoid liquid retention during the flow process and ensure the stability of the liquid flow.

[0042] The flow channel 14 at the bottom of the tank is used to guide the flow of the coagulation bath liquid and ensure that the liquid flows smoothly from the coagulation bath tank 1 into the wire guide tube 2. The liquid inlet of the wire guide tube 2 is connected to the flow channel, so that the coagulation bath liquid enters the wire guide tube 2 in a stable flow state, thereby maintaining the stability of the liquid flow, and further ensuring the uniform coagulation of the filament bundle 108 in the wire guide tube 2. The wire outlet 23 end of the wire guide tube 2 is horizontally extended in the direction away from the coagulation bath tank 1, ensuring that the filament bundle 108 can be stably transported out from the wire outlet 23 end along the direction of the coagulation bath flow and enter the next process, avoiding the influence of fluid turbulence on the stability of the filament bundle 108, improving the controllability and continuity of the coagulation process, and effectively improving the production efficiency and fiber quality.

[0043] Further, as an embodiment of the present invention, the horizontal extension length of the wire guide tube 2 is greater than the depth of the coagulation bath 1; specifically, the length of the horizontal section 22 of the wire guide tube 2 is preferably 2-5 times the depth of the coagulation bath 1. For example, if the depth of the coagulation bath 1 is 20 cm, the horizontal extension length of the wire guide tube 2 should be between 40 cm and 100 cm.

[0044] This method prolongs the immersion time of the tow 108 in the coagulation bath, so that the tow 108 can fully contact the coagulation bath in the horizontal section 22 of the wire guide tube 2, thereby enhancing the coagulation effect of the tow 108. Prolonging the length of the horizontal section helps the tow to reach a higher degree of coagulation before entering the subsequent process, thereby ensuring the quality and performance of the fiber.

[0045] Preferably, the wire guide tube 2 is a glass wire guide tube. Glass material has excellent chemical stability and corrosion resistance, can withstand the corrosion of the coagulation bath, and avoids the corrosion and pollution problems that may occur in metal wire guide tubes. In addition, the inner wall of the glass wire guide tube is smooth and impurities are not easily attached, which reduces the friction resistance of the wire bundle 108 during transmission, which is conducive to maintaining the integrity and surface finish of the fiber. The transparency of glass also makes it easy for operators to observe the flow state and coagulation of the wire bundle 108 in the wire guide tube 2 in real time, which is convenient for timely adjustment of process parameters to ensure the stability of the production process.

[0046] By designing the horizontal extension length of the wire guide tube 2 to be 2-5 times the depth of the coagulation bath 1, the residence time of the filament bundle 108 in the coagulation bath is extended, ensuring the full coagulation of the fiber. The horizontal section 22 provides a stable flow environment, allowing the filament bundle 108 to flow smoothly in the wire guide tube 2 along a fixed direction, reducing the adverse effects of liquid flow fluctuations and turbulence on the filament bundle 108. This design effectively avoids the problem of fiber breakage and uneven quality caused by excessive flow or turbulence during the coagulation process.

[0047] As another embodiment of the present invention, the dry-wet spinning coagulation device further includes a coagulation bath storage tank 3 for storing and circulating the coagulation bath liquid. The coagulation bath storage tank 3 is connected to the coagulation bath tank 1 through a pipeline, and is used to continuously supply the coagulation bath liquid to the coagulation bath tank 1 to ensure that the liquid level and composition in the coagulation bath tank 1 remain stable to meet the requirements of the spinning process.

[0048] Specifically, the coagulation bath storage tank 3 is connected to the coagulation bath tank 1 through a liquid supply pipeline, and a delivery pump is installed on the liquid supply pipeline to deliver the coagulation bath liquid from the coagulation bath storage tank to the coagulation bath tank. The delivery pump can be a frequency-controlled centrifugal pump or a peristaltic pump to accurately control the flow rate and delivery speed of the coagulation bath liquid and maintain the stability of the liquid level in the coagulation bath tank 1.

[0049] A connecting port 24 is provided at the end of the outlet 23 of the wire guide tube 2, and the connecting port 24 is connected to the coagulation bath storage tank 3 through a reflux pipe. After the coagulation bath liquid in the coagulation bath tank 1 completes the preliminary coagulation of the filament bundle 108, it flows through the horizontal section 22 of the wire guide tube 2, further contacts the filament bundle 108 and completes the coagulation process. Subsequently, the coagulation bath liquid flows back to the coagulation bath storage tank 3 along the reflux pipe through the connecting port 24 at the end of the outlet 23 of the wire guide tube 2.

[0050] Alternatively, the wire outlet 23 of the wire guide tube 2 forms the connecting port 24. Specifically, the wire outlet 23 of the wire guide tube 2 can be used for pulling out the wire bundle on the one hand, and on the other hand, the lower part of the wire outlet 23 of the wire guide tube 2 has an open liquid collecting trough, that is, the open end of the liquid collecting trough is located directly below the wire outlet 23 of the wire guide tube 2, and the liquid collecting trough is connected to the coagulation bath storage tank 3. The coagulation bath liquid in the wire guide tube 2 flows into the liquid collecting trough from the wire outlet 23, and flows back to the coagulation bath storage tank 3 from the liquid collecting trough.

[0051] Preferably, the bottom of the liquid collecting tank has an opening connecting the inside and outside of the liquid collecting tank, the opening is connected to the coagulation bath storage tank through a reflux pipe, and a filter screen covering the opening is provided on the opening for filtering broken wires, impurities, etc. in the coagulation bath liquid.

[0052] In order to ensure the stability of quality and temperature during the recycling of the coagulation bath, a temperature control device and a stirring device are provided in the coagulation bath storage tank 3. The temperature control device includes a heater and a cooler, which can accurately adjust the temperature of the coagulation bath according to the process requirements, usually maintained within a specific temperature range to ensure the coagulation effect of the fiber. The stirring device can be a mechanical stirrer or a magnetic stirrer, which makes the composition of the coagulation bath uniform through continuous stirring to prevent the coagulation effect from being affected by the stratification of the solvent and the non-solvent.

[0053] A filtering device (such as a filter screen) and a cooling device are installed in the reflux pipeline. The filtering device is used to remove impurities and fiber fragments that may exist in the coagulation bath to prevent them from having adverse effects on the fiber quality. The cooling device is used to adjust the temperature of the reflux coagulation bath to ensure that it has a suitable temperature when it returns to the coagulation bath storage tank and does not affect the temperature control of the entire bath.

[0054] In addition, in order to monitor and control the quality of the coagulation bath in real time, online detection devices such as temperature sensors, pressure sensors and concentration detectors can be installed on the coagulation bath storage tank 3, the liquid supply pipeline and the reflux pipeline. These devices transmit the detected data to the control system, and the control system automatically adjusts the operating parameters of the temperature control device, the delivery pump and the stirring device according to the real-time data to ensure that the temperature, flow rate and composition of the coagulation bath always meet the process requirements.

[0055] Through the above design, the coagulation bath forms a closed circulation system, which is transported from the coagulation bath storage tank 3 to the coagulation bath tank 1 through the liquid supply pipe, and after completing the initial coagulation of the filament bundle 108, it flows through the horizontal section 22 of the wire guide tube 2 to further coagulate the filament bundle 108, and then flows back to the coagulation bath storage tank 3 through the connecting port 24 and the reflux pipe. In this way, not only the recycling of the coagulation bath is realized, the production cost and resource consumption are reduced, but also the quality stability of the coagulation bath is ensured, and the continuity of the spinning process and the quality consistency of the fiber are improved.

[0056] In practical applications, the capacity and shape of the coagulation bath storage tank 3 can be designed according to the production scale and process requirements. In order to improve the automation of the system, an automatic alarm function can be set in the control system. When the temperature, concentration or liquid level of the coagulation bath exceeds the set range, the system will automatically alarm and make corresponding adjustments to ensure the safety and stability of production.

[0057] In addition, the coagulation bath storage tank 3 can be made of corrosion-resistant materials, such as stainless steel or high-strength plastic, and the inner wall is polished to prevent the chemical components in the coagulation bath from corroding the storage tank. The design of the storage tank should also consider the convenience of cleaning and maintenance, and a cleaning port or a sewage outlet can be set at an appropriate position to clean the storage tank regularly to ensure the purity of the coagulation bath.

[0058] By establishing a circulation system between the coagulation bath tank 1, the wire guide tube 2 and the coagulation bath storage tank 3, efficient utilization and recycling of the coagulation bath liquid are achieved, environmental pollution is reduced, and the concept of green production and sustainable development is met. At the same time, the coagulation bath liquid maintains a stable flow and uniform composition in the entire system, reducing fluctuations in the spinning process and ensuring the coagulation quality and stable performance of the fiber.

[0059] Furthermore, in this embodiment, the wire outlet 23 of the wire guide tube 2 is arranged above the communication port 24. This design allows the coagulation bath liquid to smoothly flow back to the coagulation bath storage tank 3 through the communication port 24, while the wire bundle 108 extends from the wire outlet 23 in the horizontal direction or upward, avoiding interference between the wire bundle 108 and the reflux liquid, and ensuring the transmission stability of the wire bundle 108 and the uniformity of the coagulation effect.

[0060] As another embodiment of the present invention, Figure 1 As shown, the coagulation bath 1 is stepped from the notch 13 to the bottom 14. The coagulation bath 1 is designed with a multi-step structure, starting from the notch 13, the inner wall size gradually decreases along the depth direction to form a stepped inner cavity structure.

[0061] Specifically, the coagulation bath 1 includes a first stepped groove 11 and a second stepped groove 12. The first stepped groove 11 is located above the second stepped groove 12. The cross-sectional area of ​​the first stepped groove 11 is larger than that of the second stepped groove 12. The first stepped groove 11 and the second stepped groove 12 are connected via a stepped transition section.

[0062] The filament bundle 108 ejected from the spinneret assembly first enters the first stepped groove 11, and initially contacts the coagulation bath to start the coagulation process. Since the cross-sectional area of ​​the first stepped groove 11 is large, the coagulation bath has a large volume here, which can provide sufficient space and coagulation bath volume, so that the filament bundle 108 is fully in contact with the coagulation bath, which reduces the impact force of the filament bundle 108 when entering the coagulation bath, and avoids the filament bundle 108 from being broken due to excessive resistance.

[0063] Subsequently, the filament bundle 108 enters the second stepped groove 12 along with the flow of the coagulation bath. Since the cross-sectional area of ​​the second stepped groove 12 is small, the flow rate of the coagulation bath increases here, which helps to further remove the solvent on the surface of the filament bundle and accelerate the coagulation process. At the same time, the stepped transition design enables the coagulation bath to form different flow characteristics at different depths, optimizing the coagulation environment of the filament bundle in the coagulation bath 1. The stepped structure can reduce the turbulence of the coagulation bath in the groove, reduce the shaking and swinging of the filament bundle during the coagulation process, and ensure the straightness and surface quality of the fiber; and the stepped structure of the coagulation bath 1 helps to form a temperature gradient in the depth direction, so that the temperature of the coagulation bath changes gradually from top to bottom, meeting the temperature requirements of the filament bundle at different coagulation stages, and further improving the quality of the fiber.

[0064] The present invention also provides a lyocell spinning device, comprising the above-mentioned dry-wet spinning coagulation device, and also comprising a spinneret 4. The spinneret 4 is arranged above the coagulation bath 1, and its spinneret is arranged toward the notch 13 of the coagulation bath 1. The filament bundle 108 ejected from the spinneret of the spinneret 4 first enters the coagulation bath 1 for preliminary coagulation, then enters the wire guide tube 2 for further coagulation, and finally is pulled out by the filament outlet 23 of the wire guide tube 2 by the traction device.

[0065] In this embodiment, a liquid outlet is provided at the bottom 14 of the coagulation bath 1, and the spinneret of the spinneret 4 is arranged vertically opposite to the liquid outlet. The purpose of this design is to allow the filament bundle 108 to directly enter the coagulation bath 1 in a vertical direction after being ejected from the spinneret 4, and to be located on the same vertical line as the liquid outlet of the coagulation bath 1, thereby ensuring that the movement path of the filament bundle 108 in the coagulation bath 1 is stable, reducing lateral swing, and improving the molding quality of the fiber.

[0066] The lyocell spinning equipment provided in this embodiment forms an efficient spinning system by optimizing the structure and relative position of the spinneret 4, the coagulation bath tank 1, the wire guide tube 2 and the coagulation bath storage tank 3. After the tow is ejected from the spinneret 4, it passes through the stepped groove of the coagulation bath tank 1 and the horizontal section 22 of the wire guide tube 2 in sequence, achieving sufficient and stable coagulation. The circulation system of the coagulation bath ensures that the quality and temperature of the coagulation bath are stable, and the resource utilization rate is high. The overall design improves the quality and production efficiency of the fiber product, and has significant economic and technical advantages.

[0067] Furthermore, the lyocell spinning device of the present invention further comprises: a warping roller 5, a waste yarn recovery device 9, a washing and sizing device 6, a drying roller 7 and a winding device 8, which are sequentially arranged downstream of the coagulation device along the running direction of the yarn bundle 108. The yarn bundle 108 is pulled from the yarn guide tube 2 of the coagulation device to the warping roller 5, and then pulled from the warping roller 5 to the drying roller 7. In this process, the yarn bundle 108 is washed and sizing treated by the washing and sizing device 6.

[0068] The warping roller 5 is arranged on one side above the drying roller 7, and is mainly used to initially draw and arrange the tow 108 drawn from the wire guide tube 2. The surface of the warping roller 5 is specially treated to have a good friction coefficient, which can stably draw the tow 108, ensure the uniform tension of the tow 108, and avoid fiber breakage or quality defects caused by uneven tension.

[0069] The waste silk recovery device 9 is arranged between the warping roller 5 and the washing and sizing device 6, and is used to recover the waste silk and broken ends generated during the spinning and drawing process. The waste silk recovery device 9 includes a collection tank and a conveyor belt, which can collect and clean the waste silk in time to prevent it from being entangled in the equipment and affecting normal production. The recovered waste silk can be regenerated to reduce resource waste.

[0070] The washing and sizing device 6 is arranged on the other side above the drying roller 7, and is used to wash and sizing the tow 108. The washing part adopts a multi-stage water bath or spraying method to fully wash the tow 108, remove the coagulation bath and solvent remaining on the fiber surface, and improve the purity of the fiber. The sizing part uses a spraying method to evenly coat the slurry on the surface of the tow 108, enhance the smoothness and antistatic performance of the fiber, and improve the subsequent processing performance of the fiber.

[0071] The drying roller 7 is used to dry the washed and sized tow 108. The drying roller 7 is thermostatically controlled and has a heating device inside, which can evenly heat the roller surface to ensure that the tow 108 is evenly heated during the drying process. The drying temperature and speed can be adjusted according to the fiber type and process requirements to prevent the fiber from being brittle due to over-drying or having too high a moisture content due to insufficient drying.

[0072] The winding device 8 is arranged downstream of the drying roller 7, and is used to wind the dried tow 108 into a drum, which is convenient for subsequent storage and transportation. The winding device 8 is equipped with a tension control system and a wire arrangement mechanism, which can automatically adjust the winding speed and tension to ensure that the fiber is wound evenly, the drum is tight and flat, and the fiber is prevented from being damaged during the winding process.

[0073] Furthermore, if Figure 1 As shown, the Lyocell spinning equipment also includes: The spinning solution storage tank 106 is arranged upstream of the spinneret 4 and is connected to the spinneret 4 through a connecting pipe 107. The spinning solution storage tank 106 is used to store the spinning solution required for spinning, ensuring that the spinning solution can be continuously and stably supplied during the spinning process. A metering pump 103 is arranged on the connecting pipe 107, which is used to pump the spinning solution to the spinneret 4. The metering pump 103 can accurately control the delivery amount of the spinning solution, ensuring that the spinning solution is supplied to the spinneret 4 at a constant flow rate and pressure, thereby stabilizing the formation and quality of the fiber. The metering pump 103 can adopt a gear pump, a screw pump or a plunger pump, and the specific type can be selected according to the viscosity of the spinning solution and the process requirements.

[0074] Further, the power system of the lyocell spinning device includes a motor 10, which is connected to a metering pump 103 through a transmission gear 102, and is used to drive the metering pump 103 to pump the spinning solution. The output shaft 101 of the motor 10 is connected to the transmission gear 102, and the transmission gear 102 is connected to the metering pump 103, forming a power transmission system. The motor 10 preferably adopts a variable frequency motor or a servo motor to achieve accurate control of the speed of the metering pump 103.

[0075] During the spinning process, the spinning solution in the spinning solution storage tank 106 is transported to the metering pump 103 through the connecting pipe 107. When the motor 10 is running, its output shaft drives the metering pump 103 to rotate through the transmission gear 102. The gear ratio of the transmission gear 102 is carefully designed to ensure that the speed and delivery volume of the metering pump 103 meet the requirements of the spinning process.

[0076] The metering pump 103 pumps the spinning solution to the spinneret 4 at a constant flow rate and pressure. A homogenizing device is provided in the spinneret 4 to make the pressure of the spinning solution uniform at the spinneret orifice to prevent the flow rate fluctuation from causing uneven fiber thickness. The spinning solution is extruded from the spinneret orifice of the spinneret 4 to form a thin stream and enter the notch 13 of the coagulation bath 1 to start the coagulation molding process.

[0077] Preferably, a stirring paddle 1061 is provided in the spinning solution storage tank 106 for continuously stirring the spinning solution to maintain the uniformity and stability of the spinning solution. The stirring paddle 1061 is driven by a motor and rotates at an appropriate speed to prevent precipitation or uneven concentration in the spinning solution, thereby ensuring the quality of the spinning solution and improving the quality of the finished fiber.

[0078] Another pump body 104 is also provided on the connecting pipe 107. The pump body 104 is located between the spinning solution storage tank 106 and the metering pump 103, and is used to initially transport the spinning solution from the spinning solution storage tank 106 to the metering pump 103. The pump body 104 provides the primary transport power of the spinning solution, ensuring that the spinning solution can be transported to the metering pump 103 at a stable flow rate and pressure, reducing the load of the metering pump 103 and extending its service life. The pump body 104 can be a corrosion-resistant centrifugal pump or a screw pump, and the specific selection can be optimized according to the viscosity and flow characteristics of the spinning solution.

[0079] In addition, a filter 105 is provided downstream of the pump body 104 and upstream of the metering pump 103. The filter 105 is used to remove impurities and tiny particles in the spinning solution to prevent these impurities from entering the metering pump 103 and the spinneret 4, causing equipment wear, blockage and fiber quality degradation. The mesh size of the filter 105 can be selected according to the characteristics of the spinning solution and process requirements, and a 10-50 micron filter is usually used to ensure the filtering effect.

[0080] As an embodiment of the present invention, a lyocell spinning process is provided, comprising: Raw material preparation: In the spinning solution storage tank 106, pulp (cellulose raw material) is mixed with N-methylmorpholine-N-oxide (NMMO) solution to prepare a spinning solution with a solid content of 12%; the mixing temperature is 130°C to ensure that the pulp is fully dissolved to form a uniform and stable spinning solution; Transport and filtration of spinning solution: The dissolved spinning solution is transported to the filter 105 through the connecting pipe 107 by using the pump body 104. The spinning solution is filtered through the filter 105 to remove impurities and undissolved substances to ensure the purity of the spinning solution; Metering and extrusion of spinning solution: the filtered spinning solution is accurately metered using a metering pump 103 to ensure a stable flow rate and pressure; the metered spinning solution is extruded through a spinneret 4 to form a thin stream; the temperature of the spinning solution is always maintained at 130°C during the whole process; Initial stretching and orientation (dry section): The thin stream first passes through a 2-3 mm air layer (dry section), during which the fibers are initially stretched and oriented to improve the degree of orientation.

[0081] Fiber coagulation (wet section): After passing through the air layer, the fiber enters the coagulation bath (wet section) in the coagulation bath tank 1; the temperature of the coagulation bath is maintained at 10°C, and the coagulation bath liquid is usually deionized water or a diluted NMMO aqueous solution; in the coagulation bath, the solvent NMMO is washed away, and the cellulose is re-condensed and gradually solidified into a shape; Fiber extraction and coagulation: The fibers entering the coagulation bath 1 are then further coagulated in the wire guide tube 2 and extracted onto the warping roller 5 as the coagulation bath flows; Post-treatment of the primary filaments: The primary filaments are further washed, sizing and dried; the filaments are sizing to evenly coat the fiber surface with sizing to increase the smoothness and wear resistance of the yarns; Winding: The filament is unwound from the drying roller 7, enters the winding device 8, and is wound into a filament tube.

[0082] The lyocell filaments prepared by this process have stable fiber quality, high Young's modulus and tensile strength. The fiber diameter is uniform and the surface quality is good, meeting the requirements of high-quality textiles. The spinning speed reaches 300 m / min, which significantly improves the production efficiency. In addition, the solvent NMMO is effectively recycled, which reduces pollution to the environment, reduces production costs, and improves economic benefits.

[0083] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A dry-wet spinning coagulation device, characterized in that: include: A coagulation bath tank, used for containing a coagulation bath liquid; The wire guide tube is horizontally extended at least partially, with a liquid inlet at one end connected to the coagulation bath and a wire outlet at the other end. The wire bundle in the coagulation bath enters the wire guide tube from the liquid inlet, flows through its horizontal section for coagulation, and is pulled out from the wire outlet.

2. The dry-wet spinning and coagulation equipment according to claim 1, characterized in that: The bottom of the coagulation bath is provided with a liquid outlet, the wire guide tube is arranged below the coagulation bath, the liquid inlet end of the wire guide tube is bent upward to communicate with the liquid outlet of the coagulation bath, and the wire outlet end is horizontally extended away from the coagulation bath.

3. The dry-wet spinning and coagulation equipment according to claim 1, characterized in that: The bottom of the coagulation bath is provided with a flow channel extending radially along the bottom wall of the coagulation bath, the liquid inlet of the wire guide tube is connected with the flow channel, and the wire outlet end is horizontally extended in a direction away from the coagulation bath; Preferably, the flow channel extends radially outward from the center of the bottom of the coagulation bath tank to the edge of the bottom of the tank to form a liquid outlet, and the liquid inlet of the wire guide tube is connected to the liquid outlet of the flow channel; Preferably, the flow channel is arranged to be inclined downward from the center of the groove bottom to the edge thereof.

4. A dry-wet spinning and coagulation device according to any one of claims 1 to 3, characterized in that: The horizontally extending length of the wire guide tube is greater than the depth of the coagulation bath.

5. The dry-wet spinning and coagulation equipment according to claim 4, characterized in that: The horizontal extension length of the wire guide tube is 2-5 times the depth of the coagulation bath; Preferably, the wire guide tube is a glass wire guide tube.

6. A dry-wet spinning and coagulation device according to any one of claims 1 to 5, characterized in that: It also includes a coagulation bath storage tank for storing coagulation bath liquid. The coagulation bath tank and the wire outlet end of the wire guide tube are respectively connected to the coagulation bath storage tank. The coagulation bath liquid in the coagulation bath storage tank is transported to the coagulation bath tank, flows from the coagulation bath tank through the wire guide tube and flows back to the coagulation bath storage tank.

7. The dry-wet spinning and coagulation equipment according to claim 6, characterized in that: The lower part of the outlet end of the wire guide tube is provided with an open liquid collecting tank, which is connected with the coagulation bath storage tank. The coagulation bath liquid in the wire guide tube flows into the liquid collecting tank from the outlet and flows back to the coagulation bath storage tank from the liquid collecting tank.

8. The dry-wet spinning and coagulation equipment according to claim 7, characterized in that: A communication port is provided at the bottom of the liquid collecting tank for communicating with the coagulation bath storage tank, and a filter screen is arranged on the communication port.

9. A dry-wet spinning and coagulation device according to any one of claims 1 to 8, characterized in that: The coagulation bath tank is arranged to gradually decrease from the tank opening to the tank bottom in a stepped manner.

10. A lyocell spinning device, characterized in that: It comprises the dry-wet spinning and coagulation equipment as described in any one of claims 1 to 9.

Images